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Accumulated Other Comprehensive Loss (Notes) | 6 Months Ended
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Jun. 30, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | Accumulated Other Comprehensive Loss Accumulated other comprehensive loss, net of tax, is comprised of the following:
| Pension Plan Adjustments | Other Post Retirement Employee Benefit Plan Adjustments | Total
Balance at December 31, 2022 | $ | (46.5) |  | $ | 13.3 |  | $ | (33.3) |
Amounts reclassified from accumulated other comprehensive loss | — |  | (0.1) |  | (0.1) |
Balance at June 30, 2023 | $ | (46.5) |  | $ | 13.1 |  | $ | (33.4) |
Balance at December 31, 2023 | $ | (42.0) |  | $ | 11.3 |  | $ | (30.7) |
Amounts reclassified from accumulated other comprehensive loss | 0.1 |  | (0.1) |  | (0.1) |
Balance at June 30, 2024 | $ | (41.9) |  | $ | 11.2 |  | $ | (30.7) |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481674/830-30-50-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481694/830-30-45-20 + Details
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